import {asyncRoutes, constantRoutes} from '@/router'
import {treeByRole} from "@/api/menu";
import {_import} from "@/utils/importMenu";

/**
 * Use meta.role to determine if the current user has permission
 * @param roles
 * @param route
 */
function hasPermission(roles, route) {
  if (route.meta && route.meta.roles) {
    return roles.some(role => route.meta.roles.includes(role))
  } else {
    return true
  }
}

/**
 * Filter asynchronous routing tables by recursion
 * @param routes asyncRoutes
 * @param roles
 */
export function filterAsyncRoutes(routes, roleId) {
  const res = []

  routes.forEach(route => {
    const tmp = {...route}
    if (hasPermission(roleId, tmp)) {
      if (tmp.children) {
        tmp.children = filterAsyncRoutes(tmp.children, roleId)
      }
      res.push(tmp)
    }
  })

  return res
}

const state = {
  routes: [],
  addRoutes: []
}

const mutations = {
  SET_ROUTES: (state, routes) => {
    state.addRoutes = routes
    state.routes = constantRoutes.concat(routes)
  }
}

const actions = {
  generateRoutes({commit}, roleId) {
    return new Promise(resolve => {
      let accessedRoutes
      treeByRole(roleId).then(res => {
        accessedRoutes = res.result.filter(item => {
          generate(item)
          return true;
        })
        accessedRoutes.push({path: '*', redirect: '/404', hidden: true})
        commit('SET_ROUTES', accessedRoutes)
        resolve(accessedRoutes)
      })
    })
  }
}

const generate = function (item) {
  item.component = _import(item.component)
  item.meta = {title: item.title, icon: item.icon}
  if (item.children && item.children.length > 0) {
    item.children.forEach(p => {
      generate(p)
    })
  }

}

export default {
  namespaced: true,
  state,
  mutations,
  actions
}
